Role of interfaces on the trapping of He in 2D and 3D Cu-Nb nanocomposites

Timothy G. Lach; Elvan H. Ekiz; Robert S. Averback; Nathan A. Mara; Pascal Bellon

doi:10.1016/j.jnucmat.2015.07.020

Role of interfaces on the trapping of He in 2D and 3D Cu-Nb nanocomposites

Timothy G. Lach, Elvan H. Ekiz, Robert S. Averback, Nathan A. Mara, Pascal Bellon

Research output: Contribution to journal › Article › peer-review

17 Scopus citations

Abstract

The role of interface structure on the trapping of He in Cu-Nb nanocomposites was investigated by comparing He bubble formation in nano-multilayers grown by PVD, nanolaminates fabricated by accumulative roll bonding (ARB), and 3D nanocomposites obtained by high pressure torsion (HPT). All samples were implanted with 1 MeV He ions at room temperature and characterized by cross section transmission electron microscopy (TEM). The critical He concentration leading to bubble formation was determined by correlating the He bubble depth distribution detected by TEM with the implanted He depth profile obtained by SRIM. The critical He dose per unit interfacial area for bubble formation was largest for the PVD multilayers, lower by a factor of ∼1.4 in the HPT nanocomposites annealed at 500 °C, and lower by a factor of ∼4.6 in the ARB nanolaminates relative to the PVD multilayers. The results indicate that the (111)FCC||(110)BCC Kurdjumov-Sachs (KS) interfaces predominant in PVD and annealed HPT samples provide more effective traps than the (112)KS interfaces predominant in ARB nanolaminates; however, the good trapping efficiency and high interface area of 3D HPT structures make them most attractive for applications.

Original language	English
Pages (from-to)	36-42
Number of pages	7
Journal	Journal of Nuclear Materials
Volume	466
DOIs	https://doi.org/10.1016/j.jnucmat.2015.07.020
State	Published - Jul 31 2015
Externally published	Yes

Funding

This work was supported in part by the Center for Materials at Irradiation and Mechanical Extremes, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Award Number 2008LANL1026 . The work was carried out in part in the Frederick Seitz Materials Research Laboratory (FS-MRL) Central Research Facilities, University of Illinois. Stimulating discussions with Drs. A. Misra (LANL, University of Michigan) and I. Beyerlein (LANL) are gratefully acknowledged. We also thank D. Jeffers (FS-MRL) for his assistance with operation of the Van de Graaff accelerator used to irradiate our samples and Dr. M. Sardela (FS-MRL) for his assistance with XRD characterization and texture measurements.

Keywords

Copper
He bubbles
Interfaces
Nanocomposite
Niobium
Radiation effects

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title = "Role of interfaces on the trapping of He in 2D and 3D Cu-Nb nanocomposites",

abstract = "The role of interface structure on the trapping of He in Cu-Nb nanocomposites was investigated by comparing He bubble formation in nano-multilayers grown by PVD, nanolaminates fabricated by accumulative roll bonding (ARB), and 3D nanocomposites obtained by high pressure torsion (HPT). All samples were implanted with 1 MeV He ions at room temperature and characterized by cross section transmission electron microscopy (TEM). The critical He concentration leading to bubble formation was determined by correlating the He bubble depth distribution detected by TEM with the implanted He depth profile obtained by SRIM. The critical He dose per unit interfacial area for bubble formation was largest for the PVD multilayers, lower by a factor of ∼1.4 in the HPT nanocomposites annealed at 500 °C, and lower by a factor of ∼4.6 in the ARB nanolaminates relative to the PVD multilayers. The results indicate that the (111)FCC||(110)BCC Kurdjumov-Sachs (KS) interfaces predominant in PVD and annealed HPT samples provide more effective traps than the (112)KS interfaces predominant in ARB nanolaminates; however, the good trapping efficiency and high interface area of 3D HPT structures make them most attractive for applications.",

keywords = "Copper, He bubbles, Interfaces, Nanocomposite, Niobium, Radiation effects",

author = "Lach, {Timothy G.} and Ekiz, {Elvan H.} and Averback, {Robert S.} and Mara, {Nathan A.} and Pascal Bellon",

year = "2015",

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day = "31",

doi = "10.1016/j.jnucmat.2015.07.020",

language = "English",

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T1 - Role of interfaces on the trapping of He in 2D and 3D Cu-Nb nanocomposites

AU - Lach, Timothy G.

AU - Ekiz, Elvan H.

AU - Averback, Robert S.

AU - Mara, Nathan A.

AU - Bellon, Pascal

PY - 2015/7/31

Y1 - 2015/7/31

N2 - The role of interface structure on the trapping of He in Cu-Nb nanocomposites was investigated by comparing He bubble formation in nano-multilayers grown by PVD, nanolaminates fabricated by accumulative roll bonding (ARB), and 3D nanocomposites obtained by high pressure torsion (HPT). All samples were implanted with 1 MeV He ions at room temperature and characterized by cross section transmission electron microscopy (TEM). The critical He concentration leading to bubble formation was determined by correlating the He bubble depth distribution detected by TEM with the implanted He depth profile obtained by SRIM. The critical He dose per unit interfacial area for bubble formation was largest for the PVD multilayers, lower by a factor of ∼1.4 in the HPT nanocomposites annealed at 500 °C, and lower by a factor of ∼4.6 in the ARB nanolaminates relative to the PVD multilayers. The results indicate that the (111)FCC||(110)BCC Kurdjumov-Sachs (KS) interfaces predominant in PVD and annealed HPT samples provide more effective traps than the (112)KS interfaces predominant in ARB nanolaminates; however, the good trapping efficiency and high interface area of 3D HPT structures make them most attractive for applications.

AB - The role of interface structure on the trapping of He in Cu-Nb nanocomposites was investigated by comparing He bubble formation in nano-multilayers grown by PVD, nanolaminates fabricated by accumulative roll bonding (ARB), and 3D nanocomposites obtained by high pressure torsion (HPT). All samples were implanted with 1 MeV He ions at room temperature and characterized by cross section transmission electron microscopy (TEM). The critical He concentration leading to bubble formation was determined by correlating the He bubble depth distribution detected by TEM with the implanted He depth profile obtained by SRIM. The critical He dose per unit interfacial area for bubble formation was largest for the PVD multilayers, lower by a factor of ∼1.4 in the HPT nanocomposites annealed at 500 °C, and lower by a factor of ∼4.6 in the ARB nanolaminates relative to the PVD multilayers. The results indicate that the (111)FCC||(110)BCC Kurdjumov-Sachs (KS) interfaces predominant in PVD and annealed HPT samples provide more effective traps than the (112)KS interfaces predominant in ARB nanolaminates; however, the good trapping efficiency and high interface area of 3D HPT structures make them most attractive for applications.

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KW - Interfaces

KW - Nanocomposite

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ER -

Role of interfaces on the trapping of He in 2D and 3D Cu-Nb nanocomposites

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